Antony Flew was one of the world’s most famous atheists of the 20th century. He debated William Lane Craig and others on the existence of God. But eventually his recognition of the profound order and complexity of the universe, and its apparent fine-tuning, was a decisive reason for the renowned atheist to change his mind about God’s existence.

In a fascinating interview with Dr. Ben Wiker, Flew explains:

“There were two factors in particular that were decisive. One was my growing empathy with the insight of Einstein and other noted scientists that there had to be an Intelligence behind the integrated complexity of the physical Universe.”

He concluded that it was reasonable to believe that the organization of space, time, matter and energy throughout the universe is far from random.

Flew continues in his exposition on why he changed his mind about God:

“The second was my own insight that the integrated complexity of life itself—which is far more complex than the physical Universe—can only be explained in terms of an Intelligent Source. I believe that the origin of life and reproduction simply cannot be explained from a biological standpoint . . . The difference between life and non-life, it became apparent to me, was ontological and not chemical. The best confirmation of this radical gulf is Richard Dawkins’ comical effort to argue in The God Delusion that the origin of life can be attributed to a “lucky chance.” If that’s the best argument you have, then the game is over. No, I did not hear a Voice. It was the evidence itself that led me to this conclusion.”